715646621 has 2 divisors, whose sum is σ = 715646622. Its totient is φ = 715646620.

The previous prime is 715646611. The next prime is 715646639. The reversal of 715646621 is 126646517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 669256900 + 46389721 = 25870^2 + 6811^2 .

It is a cyclic number.

It is not a de Polignac number, because 715646621 - 2⁶ = 715646557 is a prime.

It is a super-2 number, since 2×715646621² = 1024300172297435282, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (715646611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 357823310 + 357823311.

It is an arithmetic number, because the mean of its divisors is an integer number (357823311).

Almost surely, 2^715646621 is an apocalyptic number.

It is an amenable number.

715646621 is a deficient number, since it is larger than the sum of its proper divisors (1).

715646621 is an equidigital number, since it uses as much as digits as its factorization.

715646621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 715646621 is about 26751.5723089317. The cubic root of 715646621 is about 894.4708839488.

The spelling of 715646621 in words is "seven hundred fifteen million, six hundred forty-six thousand, six hundred twenty-one".